Dibenzocycloheptene-5-hydroxamic acid and ether and carbonyl derivatives thereof



United States Patent Q7 3,475,485 DIBENZOCYCLOHEPTENE-S-HYDROXAMIC ACID AND ETHER AND CARBONYL DERIVATIVES THEREOF Martin A. Davis, Montreal, Quebec, Canada, assignor to American Home Products Corporation, New Y ork, N.Y., a corporation of Delaware No Drawing. Filed Feb. 8, 1967, Ser. No. 614,549 Int. Cl. C07c 83/08; A61k 27/00 US. Cl. 260-500.5 3 Claims ABSTRACT OF THE DISCLOSURE This invention relates to a novel chemical compounds having useful biological properties. More particularly, this invention relates to 10,1l-dihydro-SH-dibenzo[a,d]cycloheptene-S-hydroxamic acids of the following formula NHOR in which R represents hydrogen or a lower alkyl group containing from 1 to 4 carbon atoms, or a lower aliphatic acyl group containing from 2 to 4 carbon atoms, an aroyl group containing from 7 to 10 carbon atoms, or the 10,11- dihydro-5H-dibenzo[a,d]cycloheptene-S-carbonyl group.

The compounds of this invention may be prepared by the following procedure: A solution of 10,l1-dihydro-5H- dibenzo[a,d]cycloheptene-S-carbonyl chloride (prepared as described by M. A. Davis et al. in J. Med. Chem., 6, 250 (1963)), in an inert solvent such as, for example, benzene, is added to a stirred suspension of hydroxylamine hydrochloride, sodium carbonate, and water. After completion of the reaction, the desired product is collected in the conventional manner and purified by recrystallization from an appropriate solvent. In the same manner, but using alkoxyamines instead of hydroxylamine the corresponding compounds of formula in which R represents a lower alkyl group are obtained.

The compounds of the general formula in which R represents hydrogen may furthermore be acylated by conventional acylation procedures, and in this manner the corresponding acylated derivatives of the compounds of the general formula in which R represents a lower aliphatic acyl group containing from 2 to 4 carbon atoms, an aroyl group containing from 7 to 10 carbon atoms, or the 10,11- dihydro-5H-dibenzo[a,d] cyclohepten 5 carbonyl group are obtained.

The compounds of this invention have useful biological properties and are of value as medicaments. In mammals, at doses Well below those causing toxic manifestations, they inhibit the convulsion caused by experimental electroshock and are useful as anti-convulsant agents. For this purpose, they may be administered in the form of dry powder capsules, compressed tablets or as suspensions in an aqueous vehicle, containing from 100 to 400 mg. of the active 3,475,485 Patented Oct. 28, 1969 ingredient per unit dosage form. Such forms may be ad ministered from twice to five times daily. The novel compounds further have activity :against Trichomonas vaginalz's and are trichomonacidal agents. For this purpose, they may be formulated with suitable excipients as vaginal inserts or vaginal suppositories each containing from 50-500 mg. of the active ingredient. Said forms may be administered twice or thrice daily for periods of time of from 2 to 4 weeks. In addition to the above-mentioned desirable biological properties, the compounds have activity against certain pathogenic'fungi, in particular, Microsporum gypseum and Trichophyton: granulosum are anti-fungal agents. As such, they may be formulated with suitable excipients in the form of lotions, ointments, or creams containing from 0.1-1 percent of the active ingredient and may be applied to the skin as required.

The following formulae and descriptive examples will illustrate my invention:

NHOR in NOH Room/ 2 doNoH EXAMPLE 1 l0, 1 1-dihydro-5H-dibenzo[a,d] cycloheptene-S- hydroxamic acid A solution of 10,1l-dihydro-5H-dibenzo[a,d] cycloheptene-S-carbonyl chloride (9.0 g.) in benzene (50 ml.) is added with good stirring to a mixture of hydroxylamine hydrochloride (12.3 g.), sodium carbonate (19.2 g.), and water (10 ml.), in benzene ml.). The reaction mixture is stirred for two hours and then filtered. The solid material is stirred with warm water followed by ether and is dried. There is thus formed 6.0 g. of the crude title product which is recrystallized from a mixture of isopropyl acetate and ethanol. The purified sample thus obtained has M.P. l90-l9l C. and furnishes a positive hydroxamic test with aqueous ferric chloride solution. Elemental analysis confirms the empirical formula C16H15NO2- In the same manner, but using the hydrohalide salts of methoxylamine, ethoxyamine, propoxyamine or butoxyamine instead of hydroxyamine hydrochloride, the corresponding O-met-hyl, O-ethyl, O-propyl, and O-butyl ethers of 10,11-dihydro-5H-dibenzo[a,d1cycloheptene-5- hydroxamic acid are also obtained.

EXAMPLE 2 When a molar excess of 10,1l-dihydro-SH-dibenzo- [a,d]cycloheptene-S-carbonyl chloride is used in the reaction described in Example 1, the isolated product has M.P. 176 C. upon recrystallization from methanol and gives a negative hydroxamic acid test. Elemental analysis confirms the empirical formula C 'H NO and its structure is shown by infrared and ultraviolet spectral data, to be the compound N-O-bis(10,11-dihydro-5H- dibenzo [a,d] cycloheptene-S-carb onyl hydroxylamine.

Similarly, when acylating 10,11-dihydro-5H-dibenzo- [a,d]cycloheptene-S-hydroxamic acid with a lower aliphatic acyl halide containing from 2 to 4 carbon atoms, oxybenzoyl and the 10,1l-dihydro-SH-dibenzo[a,d]cyclosuch as, for example acetyl chloride, propionyl chloride, heptene-S-carbonyl group.

or butyryl chloride, or with aroyl halide containing from 2. 10,11-dihydro 5H dibenzo[a,d]cycloheptene-S- 7 to 10 carbon atoms, such as, for example, benzoyl hydroxamic acid. chloride, phenylacetyl chloride, or trimethoxybenzoyl 3. N-O-bis(1 Y H l/ chloride, the corresponding acetyl, propionyl, butyryl, 5 pt -5- a y y y benzoyl, phenylacetyl, or trimethoxybenzoyl esters of 10,11 dihydro-5H-dibenzo[a,d] cycloheptene-S-hydrox- References Cited amiclacid are also obtained. UNITED STATES PATENTS I q aim:

10 3,072,701 1/ 1963 Wrlght et a1. 260-453 A fmmula 3,168,561 2/1965 Richter et al. 260-453 3,187,041 6/1965 Richter et a1. 3,236,871 2/1966 Hinman et a1. 260-453 3,371,106 2/1968 Berliner et a1. 260-545 X 15 3,242,212 3/1966 Daviset a].

NHOR

where R is selected from the group consisting of hydrogen, lower alkyl containing from 1 to 4 carbon atoms, 260-453, 544, 545; 424-498, 315 acetyl, propionyl, butyryl, benzoyl, phenacetyl, trimeth- 

